Why Hantavirus “Cannot” Become the Next COVID-19? — A Deep Dive into the Uncomparability of the Two Viruses

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Whenever a strange new virus makes it onto the news headlines, people’s first reaction is almost instinctive—“Could this be the next COVID-19?

This association is understandable. The collective trauma left by the global pandemic has made society highly sensitive to any gathering-related outbreak. But comparing Hantavirus with COVID-19 is not only scientifically wrong; it may also lead to systemic misjudgments in the allocation of public resources.

At a rare, plainly worded press conference on May 7, Maria Van Kerkhove, Director of the WHO’s Department of Epidemic and Pandemic Preparedness, made an unmistakably direct statement: “This is not COVID-19; this is not the beginning of flu. ” The moment her words were spoken, she cut off every chain of alarmist logic. Her assessment is not diplomatic phrasing—it is based on fundamental differences in the transmission mechanisms of the two viruses:

COVID-19 viruses achieve efficient person-to-person transmission through droplets and aerosols, with an R₀ (basic reproduction number) of about 2.5 to 3 in the era of the original strain—meaning an infected person typically infects 2.5 to 3 others on average. Every breath could become a source of infection—this is the transmission dynamic basis for a global pandemic.

Meanwhile, the transmission route of Hantavirus is completely different. Andes virus does have the ability for human-to-human transmission, but the preconditions are extremely stringent: it requires “long-term, close contact,” usually occurring among family members, intimate partners, or close caregivers, and it only has limited infectiousness once the patient clearly develops symptoms. Asymptomatic infections are not considered to have transmission capability. In other words, Hantavirus is not a virus that spreads efficiently through the air; it is a virus that, even if it spreads from person to person, still needs specific conditions to carry transmission to completion.

The two viruses are fundamentally not on the same level of transmission efficiency.

A WHO spokesperson, Linde-Mayer, made this comparison even more forcefully. He disclosed a key piece of empirical evidence: in this outbreak, some individuals who had close contact with infected people—including passengers who shared the same cabin—had negative virus test results. “This is enough to show that Hantavirus poses a very low risk to the general population.”

Is there a more direct rebuttal than “living in the same sealed cabin yet not getting infected”?

If you quantify transmission efficiency, the gap becomes even clearer. COVID-19’s peak R₀ can exceed 3; human-to-human transmission of Hantavirus has only been sporadically recorded in a few household cluster outbreaks, and it has never formed sustained transmission chains. In statistical terms, an R₀ significantly greater than 1 is a prerequisite to sustain person-to-person spread; yet existing epidemiological evidence indicates that even for Andes virus, its person-to-person transmission R₀ is below 1—which means the chain of transmission is extremely short, highly dependent on specific conditions, and therefore difficult to expand continuously.

Differences in the incubation period are another key variable. The incubation period of Hantavirus can be as long as 8 weeks, while COVID-19 is only between 2 and 14 days—the two differ by 4 to 16 times. WHO Director-General Tedros Adhanom Ghebreyesus was blunt about this: given that the incubation period for Andes virus can be up to 6 weeks, more cases may be reported in the future, but that does not mean the outbreak is continuing to spread steadily—most likely, it is just a delayed onset of disease in people who were previously exposed.

In other words, Hantavirus does not rely on widespread asymptomatic transmission populations to achieve spread. If you draw the transmission chain for Andes virus, you get a short chain that is costly but nevertheless continues to extend; whereas the transmission chain of COVID-19 is an infinitely expanding, disorderly network.

This fundamental difference in transmission mechanisms determines that Hantavirus does not have the transmission dynamics foundation needed to drive a global pandemic. Globally, the number of Hantavirus infection cases each year is about 2000 to 15000. And even for the entire year of 2025 alone, the number of confirmed cases recorded in the Americas is only 200 to 300. From a statistical perspective, the “denominator” for this virus is too small to support any global pandemic simulation in epidemiological models.

Low transmission efficiency plus a short transmission chain blocks every possible pathway for a localized outbreak to evolve into a global disaster. This is not optimism—it is science.
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